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He divided the many different kinds of rocks that he studied into four broad categories: Rocks from the primary age, consisting of igneous or metamorphic rocks at the cores of mountains, were the first to be deposited.

This led him to realize that Earth must be much older than the 6,000 years calculated by Ussher, an important breakthrough in the study of Earth's geologic ages, since it means that natural laws can be determined and expected to apply in the same ways over time.Though some events were catastrophic, much of Earth's geology was influenced by normal weather, erosion, and other processes spread over very long geologic ages.Accurate dating of the geologic ages is fundamental to the study of geology and paleontology, and provides important context to the life sciences, meteorology, oceanography, geophysics, and hydrology.In the mid-seventeenth century, James Ussher (1581–1656), the Archbishop of Ireland, compiled a chronology of Earth by adding up the generations named in the Bible.He determined that Earth was created the night before October 23, 4004 BC.

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